CN204788517U - Self -loopa open channel experimental apparatus that possesses teaching effects flow digital display - Google Patents
Self -loopa open channel experimental apparatus that possesses teaching effects flow digital display Download PDFInfo
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- CN204788517U CN204788517U CN201520407771.2U CN201520407771U CN204788517U CN 204788517 U CN204788517 U CN 204788517U CN 201520407771 U CN201520407771 U CN 201520407771U CN 204788517 U CN204788517 U CN 204788517U
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Abstract
The utility model discloses a self -loopa open channel experimental apparatus that possesses teaching effects flow digital display, include: self -loopa open channel experiment appearance includes: conduit, one section differential traffic signal generator for being used for producing the pressure differential signal among the conduit, the high -end liquid gas shift section of thick bamboo of pressure differential and the pressure differential low side liquid gas shift section of thick bamboo be connected with differential traffic signal generator, with the high -end liquid gas shift section of thick bamboo of pressure differential and pressure differential low side liquid gas shift section of thick bamboo sealing connection for detect the differential pressure sensor of interior compressed air of the high -end liquid gas shift section of thick bamboo of pressure differential and the interior compressed air's of a pressure differential low side liquid gas shift section of thick bamboo pressure differential, be connected with differential pressure sensor for the pressure differential signal conversion who detects differential pressure sensor becomes the microcomputer digital display table of flow. The utility model discloses it is that the experiment is with low discharge high accuracy flow instrument to possess teaching effects's flow digital display, in preferred technical scheme, can also return to zero in real time in normal flow measurement experimentation.
Description
Technical field
The utility model relates to experimental measurement field, is specifically related to a kind of self-loopa open channel experimental provision possessing teaching efficiency flow digital display.
Background technology
Water movement is a kind of very complicated spontaneous phenomenon, the rule of the situation that motive power is existed and their development, so far also could not grasp very well, hydraulic model test copies substance in kind exactly, according to similar criterion, contraction becomes model, the predominant intermolecular forces suffered by it, research experiment.In hydraulic model test, for coordinating overall project playout or studying some two-dimensional flow problem, open channel experimental tank need be built, by means of open channel experimental tank observation flow-shape, describe or shoot with video-corder various current phenomenon in experimentation.
Therefore, open channel experimental tank, as an experiment porch, at engineering fluid mechanics and hydraulics of open channels course experiment teaching and relevant field of scientific study thereof, is widely used.Wherein, the patent No. is that the Chinese invention patent of ZL200410053412.8 discloses a kind of Stoploy type self circulation open-channel test groove, traditional large-scale open channel experimental tank has been instead of since invention, the relevant every experiment of open channel can have been changed by model, be widely used in the relevant hydraulic experiment teaching of colleges and universities, effectiveness comparison is directly perceived.
This open channel experimental tank is designed with the triangular-notch weir flume of tail water backflow, and by traditional triangle weir measuring flow, but this could measure after needing open channel experimental tank to keep the certain flow long period stable, has certain hysteresis quality.Along with the development of modern measurement technology, the experimental apparatus in other every profession and trade fields on the Innovation and application of modern measurement technology far ahead of fluid mechanics class experiment teaching instrument.Experimental apparatus only only has traditional measuring method to be out of step with the times the development of technology, also be not easy to motivate students' interest in learning, therefore, traditional experimental apparatus needs to constantly bring forth new ideas, such as whether fluid mechanics principle can be combined with modern measurement technology, solve the high-acruracy survey problem of the low discharge experiment tube low discharge in this kind of small-sized teaching experimental device of open channel experimental tank, such theory application reality can allow a whole set of experimental provision have more teaching efficiency.
Utility model content
The purpose of this utility model there is provided a kind of self-loopa open channel experimental provision possessing teaching efficiency flow digital display, and in optimal technical scheme, can also return to zero in real time in normal flow measurement experimentation, be low voltage difference high-precision flow instrument.
Possess a self-loopa open channel experimental provision for teaching efficiency flow digital display, comprising:
Self-loopa open channel experiment instrument, includes: aqueduct, and one section in described aqueduct is the differential flow signal generator for generation of pressure difference signal;
The pressure reduction high-end liquid cyclostrophic creeling be connected with described differential flow signal generator and the creeling of pressure reduction low side liquid cyclostrophic, the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic are respectively provided with a deflating valve, and these two deflating valves are externally connected with movable sealing plug;
Be tightly connected with the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic, for detecting the differential pressure pickup of the pressure reduction of described pressure reduction high-end liquid cyclostrophic creeling compressed air and pressure reduction low side liquid cyclostrophic creeling compressed air;
Be connected with described differential pressure pickup, the pressure difference signal for being detected by described differential pressure pickup converts the micro computer digital display meter of flow to.
The utility model has differential flow signal generator, connects the high-end independent double-cylinder type liquid cyclostrophic creeling with pressure reduction low side of pressure reduction, differential pressure pickup and micro computer digital display meter respectively.Micro computer digital display meter, can realize the method for the signal voltage of input by array matching, makes output become corresponding flow magnitude of physical quantity digital display and exports.Adopting the creeling of liquid cyclostrophic to improve measuring accuracy, is the high-accuracy flowrate measuring tool of a kind of low voltage difference.
Described differential flow signal generator is the flow measurement pipeline section that can produce pressure difference signal.Structure is measured in the substantially differential front end that differential flow signal generator can adopt venturi, ozzle, orifice-plate type etc. to write several fluid mechanics measuring flows of textbook over 100 years, self-loopa open channel experiment instrument in the utility model is designed with orifice plate because of in experimental channel own, therefore this orifice differential pressure formula flow signal generator preferred.
As preferably, described self-loopa open channel experiment instrument also includes:
Self-loopa supply tank;
By the water tank of voltage regulation that described aqueduct is communicated with described self-loopa supply tank;
To be arranged in described self-loopa supply tank and electric control pump (preferred available submersible pump) for supplying water to described water tank of voltage regulation;
Experimental trough, the head side of described experimental trough is communicated with described water tank of voltage regulation, the porous tail-gate that turning axle is rotatably connected with described experimental trough is provided with in the afterbody of described experimental trough, described turning axle is erected in described experimental trough along the Width of described experimental trough, and the afterbody bottom surface of described experimental trough is provided with the lower mouth of a river;
For accepting the triangular-notch weir flume of the lower mouth of a river water outlet of described experimental trough, be provided with water-stabilizing board, triangular-notch weir and water return outlet from the side, the lower mouth of a river near described experimental trough successively to opposite side in described triangular-notch weir flume, described water return outlet is communicated with described self-loopa supply tank.
The structure of described self-loopa open channel experiment instrument can adopt prior art, as adopted application number Stoploy type self circulation open-channel test groove disclosed in the Chinese invention patent application of 200410053412.8.
As preferably, described differential flow signal generator is provided with pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe;
The creeling of described pressure reduction high-end liquid cyclostrophic is provided with the water inlet be communicated with described pressure reduction high side pressure conducting tube;
Described pressure reduction low side liquid cyclostrophic creeling is provided with the water inlet be communicated with described pressure reduction low side pressure transmission pipe.
Further preferably, the water inlet of described pressure reduction high-end liquid cyclostrophic creeling is positioned at the sidewall bottom of described pressure reduction high-end liquid cyclostrophic creeling;
The water inlet of described pressure reduction low side liquid cyclostrophic creeling is positioned at the sidewall bottom of described pressure reduction low side liquid cyclostrophic creeling.
Further preferably, the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling be arranged on the creeling of described pressure reduction high-end liquid cyclostrophic sidewall and higher than the water inlet of described pressure reduction high-end liquid cyclostrophic creeling;
The deflating valve of described pressure reduction low side liquid cyclostrophic creeling be arranged on the creeling of described pressure reduction low side liquid cyclostrophic sidewall and higher than the water inlet of described pressure reduction low side liquid cyclostrophic creeling.
Further preferably, be provided with orifice plate in the pipeline section of the aqueduct at described differential flow signal generator place, described pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe are positioned on the aqueduct of described orifice plate both sides.
As preferably, the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic are respectively provided with a valve, the valve of described pressure reduction high-end liquid cyclostrophic creeling is described pressure reduction high-end liquid cyclostrophic creeling and the connecting interface of differential pressure pickup, and the valve of described pressure reduction low side liquid cyclostrophic creeling is described pressure reduction low side liquid cyclostrophic creeling and the connecting interface of differential pressure pickup;
The valve of described pressure reduction high-end liquid cyclostrophic creeling is higher than the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling;
The valve of described pressure reduction low side liquid cyclostrophic creeling is higher than the deflating valve of described pressure reduction low side liquid cyclostrophic creeling.
Further preferably, the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling and the deflating valve of described pressure reduction low side liquid cyclostrophic creeling contour.
Further preferably, the described self-loopa open channel experimental provision possessing teaching efficiency flow digital display, also comprises: the high-end electric control valve of pressure reduction, pressure reduction low side electric control valve and control the control circuit of the high-end electric control valve of described pressure reduction and pressure reduction low side electric control valve;
The high-end electric control valve of described pressure reduction be connected on the creeling of described pressure reduction high-end liquid cyclostrophic be connected with differential pressure pickup between in gas circuit; Described pressure reduction low side electric control valve be connected on described pressure reduction low side liquid cyclostrophic creeling be connected with differential pressure pickup between in gas circuit;
The high-end electric control valve of described pressure reduction at least comprises three tunnels, one tunnel of the high-end electric control valve of described pressure reduction is communicated with the valve of described pressure reduction high-end liquid cyclostrophic creeling, another road of the high-end electric control valve of described pressure reduction is measured mouth with described differential pressure pickup first and is connected, and also has a road and air conducting;
Described pressure reduction low side electric control valve at least comprises three tunnels, one tunnel of described pressure reduction low side electric control valve is communicated with the valve of described pressure reduction low side liquid cyclostrophic creeling, another road of described pressure reduction low side electric control valve is measured mouth with described differential pressure pickup second and is connected, and also has a road and air conducting.
When the high-end electric control valve of pressure reduction and the energising of pressure reduction low side electric control valve, the pressure measurement end making differential pressure pickup all with air conducting, can return to zero in real time.
Compared with prior art, the utility model tool has the following advantages:
1, problem is measured: devise double-cylinder type liquid-gas transfer device when the utility model possesses the high-precision real of the small-bore experiment tube low discharge of self-loopa open channel experimental provision ingenious applied fluid mechanics principle solution open channel experimental provision of teaching efficiency flow digital display, by between flow signal generator and sensor by the mode of the direct transmission of pressure of the liquid in communicating pipe, by the bitubular of liquid gas shift, change the medium of gas into, send pressure to sensor, completely eliminate the surface tension effects on sensor connecting path, make the precision of low discharge can bring up to 1% by 10%, and the high-precision digital-display flow instrument having filled up this type of small-sized teaching hydrodynamic calculations instrument of picture open channel experimental provision is blank,
2, this experimental provision is air because of the pressure transmission medium of high precision sensor, thus makes cell pressure chip away from water or corrosivity hydraulic fluid, sensor is improved serviceable life greatly;
3, the orifice differential pressure formula flow signal generator that configures of this experimental provision is that long-term write is in the last hundred years taught the flowmeter of conventional fluid mechanics principle application of book.Introduce experimental teaching, student is had to the results of learning of good theoretical connected applications;
4, this experimental provision is after use liquid gas shift pressure measurement cylinder, apply automatically controlled miniature Standard Valve Design gas path on-off switched system cleverly, 2 of differential pressure pickup pressure measurement interfaces can be made at any time all to lead to air, open channel experimental provision real-time, tunable zero in experimentation can be made, avoid in measurement process traditional instrument when needing to detect zero point and just must can carry out the trouble that verifies by complete shut-down flow valve, this real-time detection function is especially necessary in education experiment.
5, be configured with the flow of digit display electric pilot (i.e. micro computer digital display meter) of band microcomputer chip, flow simulation voltage can be become real-time flow data by microcomputer chip modulus non-linear conversion, digital display shows, intuitive and convenient.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model possesses the self-loopa open channel experimental provision of teaching efficiency flow digital display;
Fig. 2 is the structural representation of double-cylinder type high-precision flow digital display instrument in the utility model;
Fig. 3 is the circuit diagram of the high-end electric control valve of the utility model pressure reduction, pressure reduction low side electric control valve and control circuit.
Embodiment
As shown in Figure 1, a kind of self-loopa open channel experimental provision possessing teaching efficiency flow digital display, comprising: self-loopa open channel experiment instrument and double-cylinder type high-precision flow digital display instrument 38.
Wherein self-loopa open channel experiment instrument is with reference to the structural design adopting ZL200410053412.8 Stoploy type self circulation open-channel test groove, as described in Figure 1, self-loopa open channel experiment instrument, include: aqueduct 17, one section in aqueduct 17 is the differential flow signal generator 41 for generation of pressure difference signal; Self-loopa supply tank 1; By the water tank of voltage regulation 3 that aqueduct 17 is communicated with self-loopa supply tank 1; To be arranged in self-loopa supply tank 1 and electric control pump 18 for supplying water to water tank of voltage regulation 3; Experimental trough 4, the head side of experimental trough 4 is communicated with water tank of voltage regulation 3, the porous tail-gate 9 that turning axle is rotatably connected with experimental trough 4 is provided with in the afterbody of experimental trough 4, turning axle is erected in experimental trough 4 along the Width of experimental trough 4, and the afterbody bottom surface of experimental trough 4 is provided with the lower mouth of a river 10; For accepting the triangular-notch weir flume 2 of the lower mouth of a river water outlet of experimental trough 4, be provided with water-stabilizing board 12, triangular-notch weir 13 and water return outlet 19 from the side, the lower mouth of a river near experimental trough 4 successively to opposite side in triangular-notch weir flume 2, water return outlet 19 is communicated with self-loopa supply tank 1.This self-loopa open channel experiment instrument has self-loopa supply tank 1, electric control pump 18 (preferred submersible pump) is provided with in self-loopa supply tank 1, triangular-notch weir flume 2 is arranged on self-loopa supply tank 1, water tank of voltage regulation 3 is connected with establishing electric control pump 18 aqueduct 17 in self-loopa supply tank 1, aqueduct 17 is provided with flow control valve 15, flow bypass valve 16, triangular-notch weir flume 2 is furnished with experimental trough 4, experimental trough 4 head is connected with water tank of voltage regulation 3, experimental trough 4 afterbody arranges porous tail-gate 9 and the lower mouth of a river 10, the lower mouth of a river 10 end opening enters triangular-notch weir flume 2, water-stabilizing board 12 is provided with near side, the lower mouth of a river 10 successively to opposite side in triangular-notch weir flume 2, triangular-notch weir 13 and water return outlet 19, water return outlet 19 is communicated with self-loopa supply tank 1, between the inherent water-stabilizing board 12 of triangular-notch weir flume 2 and triangular-notch weir 13, steady pool tank sidewall is also provided with measuring cylinder 11, water-stabilizing board 12 has steady water hole, water can be crossed by current stabilization, measuring cylinder 11 top is provided with weir chaining pin 14, experimental trough 4 base plate is provided with multiple model mounting hole 8, experimental trough 4 groove body sidewall is provided with gate slot 5, experimental trough 4 top is arranged and is measured track 7, experimental trough chaining pin 6 is placed in be measured on track 7.
The course of work of this experiment instrument is: load the empirical model relevant to experimental project at experimental trough 4, test water electric control pump 18 water lift in case in self-loopa supply tank 1, after water tank of voltage regulation 3 voltage stabilizing, steadily enter experimental trough 4, walk around empirical model in experimental trough, fallen by the mouth of a river 10 under experimental trough 4 afterbody and enter triangular-notch weir flume 2, water level in experimental trough 4 is measured by triangular-notch weir, thus oneself goes out overcurrent flow according to triangular-notch weir flow rate conversion formulae discovery, water body goes out stream through triangular-notch weir flume 2 Triangle ID weir 13 breach again, and be back in self-loopa supply tank 1 through water return outlet 19.Then multiple measurement means is used, in observation experiment tank, current are through the fluidised form of empirical model, describe or shoot with video-corder various current phenomenon in experimentation, and each related experiment parameter such as measuring flow, to verify and to calculate the phenomenon and design parameter that different open channel hydraulic model tests.
In order to measure problem when fluid mechanics principle and modern measurement technology are measured the high-precision real combining and solve and test low discharge in above-mentioned self-loopa open channel experiment instrument, in the segment pipe especially on aqueduct 17, be provided with the differential flow signal generator 41 for generation of pressure difference signal; Venturi tube, orifice plate, ozzle equal-pressure difference type flow signal generator can be adopted to test pipeline section, this device preferably adopts orifice differential pressure formula flow signal generator, namely in the pipeline section of aqueduct 17, orifice plate 40 is provided with, the aqueduct sidewall of orifice plate 40 both sides is provided with pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe, and concrete structure for amplifying is with reference to figure 2 double-cylinder type high-precision flow digital display instrument.
As shown in Figure 2, double-cylinder type high-precision flow digital display instrument 38 includes the differential flow signal generator 41 for generation of pressure difference signal; The pressure reduction high-end liquid cyclostrophic creeling 44 be connected with differential flow signal generator 41 and pressure reduction low side liquid cyclostrophic creeling 48, pressure reduction high-end liquid cyclostrophic creeling 44 and pressure reduction low side liquid cyclostrophic creeling 48 are respectively provided with a deflating valve 43; Be connected with pressure reduction high-end liquid cyclostrophic creeling 44 and pressure reduction low side liquid cyclostrophic creeling 48, for detecting the differential pressure pickup 46 of the pressure reduction of pressure reduction high-end liquid cyclostrophic creeling 44 compressed air and pressure reduction low side liquid cyclostrophic creeling 48 compressed air; Be connected with differential pressure pickup 46, the pressure difference signal for being detected by differential pressure pickup 46 converts the micro computer digital display meter 50 of flow to.
Double-cylinder type high-precision flow digital display instrument 38, also comprises: the high-end electric control valve of pressure reduction 51, pressure reduction low side electric control valve 52 and control the control circuit of the high-end electric control valve 51 of pressure reduction and pressure reduction low side electric control valve 52.The high-end electric control valve 51 of pressure reduction at least comprises three tunnels, and a road of the high-end electric control valve of pressure reduction 51 is communicated with pressure reduction high-end liquid cyclostrophic creeling 44 compressed air, and another road of the high-end electric control valve 51 of pressure reduction is connected with differential pressure pickup 46, also has a road and air conducting.Pressure reduction low side electric control valve 52 at least comprises three tunnels, and a road of pressure reduction low side electric control valve 52 is communicated with pressure reduction low side liquid cyclostrophic creeling 48 compressed air, and another road of pressure reduction low side electric control valve 48 is connected with differential pressure pickup 46, also has a road and air conducting.
As shown in Figure 3, control circuit comprises power supply and by opening up pass 53, be connected with the positive pole of power supply by opening up one end, pass 53, the other end is connected with the positive pole of the high-end electric control valve 51 of pressure reduction and the positive pole of pressure reduction low side electric control valve 52, and the negative pole of the high-end electric control valve 51 of pressure reduction is connected with the negative pole of power supply with the negative pole of pressure reduction low side electric control valve 52.
Differential flow signal generator 41 is the flow measurement pipeline section that can produce pressure difference signal, the experiment pipeline section of apertured plate 40 in aqueduct 17 1 sections in concrete this self-loopa of employing open channel experimental provision, and pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe is provided with on aqueduct 17 sidewall of orifice plate 40 both sides.
Pressure reduction high-end liquid cyclostrophic creeling 44 and pressure reduction low side liquid cyclostrophic creeling 48 are respectively provided with a water inlet 45, and the water inlet in pressure reduction high-end liquid cyclostrophic creeling 44 is communicated with pressure reduction high side pressure conducting tube; Water inlet in pressure reduction low side liquid cyclostrophic creeling 48 is communicated with pressure reduction low side pressure transmission pipe.The water inlet of pressure reduction high-end liquid cyclostrophic creeling 44 is positioned at the sidewall bottom of pressure reduction high-end liquid cyclostrophic creeling 44; The water inlet of pressure reduction low side liquid cyclostrophic creeling 48 is positioned at the sidewall bottom of pressure reduction low side liquid cyclostrophic creeling 48.
The deflating valve of pressure reduction high-end liquid cyclostrophic creeling 44 be arranged on pressure reduction high-end liquid cyclostrophic creeling 44 sidewall and higher than the water inlet of pressure reduction high-end liquid cyclostrophic creeling 44; The deflating valve of pressure reduction low side liquid cyclostrophic creeling 48 be arranged on pressure reduction low side liquid cyclostrophic creeling 48 sidewall and higher than the water inlet of pressure reduction low side liquid cyclostrophic creeling 48.
Pressure reduction high-end liquid cyclostrophic creeling 44 and pressure reduction low side liquid cyclostrophic creeling 48 are respectively provided with a valve 42, the valve of pressure reduction high-end liquid cyclostrophic creeling 44 is connected with the high-end electric control valve 51 of pressure reduction, and the valve of pressure reduction low side liquid cyclostrophic creeling 48 is connected with pressure reduction low side electric control valve 52.
The valve of pressure reduction high-end liquid cyclostrophic creeling 44 is higher than the deflating valve of pressure reduction high-end liquid cyclostrophic creeling 44; The valve of pressure reduction low side liquid cyclostrophic creeling 48 is higher than the deflating valve of pressure reduction low side liquid cyclostrophic creeling 48; The deflating valve of pressure reduction high-end liquid cyclostrophic creeling 44 and the deflating valve of pressure reduction low side liquid cyclostrophic creeling 48 contour.
Double-cylinder type high-precision liquid flow instrument in the utility model, there is differential flow signal generator 41, in real time zeroing electric control valve unit and control circuit thereof (i.e. the high-end electric control valve of pressure reduction 51, pressure reduction low side electric control valve 52 and control the control circuit of the high-end electric control valve 51 of pressure reduction and pressure reduction low side electric control valve 52), the micro computer digital display meter 50 of the high-end independent double-cylinder type liquid cyclostrophic creeling 44 and 48 with pressure reduction low side of connection pressure reduction respectively, differential pressure pickup 46 and intelligent (band microcomputer chip).
Embodiment further illustrates as follows:
1, the bottom of the bitubular is respectively provided with water inlet 45, and be connected with the pressure tap (being respectively equipped with pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe) of the height pressure side of differential flow instrument signal generator 41 respectively, top is respectively provided with valve 42, be connected with the pressure measurement mouth of differential pressure pickup 46 respectively, the elevation places such as middle part are provided with deflating valve 43 respectively, and deflating valve 43 can be exitted and be made the most promotion of liquid level in cylinder to deflating valve 43 position.When deflating valve 43 is closed, when cross current pipe 47 is full of continuous print bubble-free pressure water body, the press water of high low side pressure tap converts gaseous tension to by the bitubular, and act on the height pressure side of differential pressure pickup 46 respectively, make the pressure transmission medium in differential pressure pickup 46 and gas circuit connecting pipe 49 thereof be gas.Owing to existing without water body in differential pressure pickup 46 and gas circuit connecting pipe 49, thus also completely eliminate the surface tension effects on path that sensor classic method connects, make the precision of low discharge can bring up to 1% by 10%.When measuring beginning, deflating valve 43 (specifically can need be adopted bleed screw mouth, bleed screw mouth is connected with movable sealing plug) open exhaust, until deflating valve 43 mouth mouth has water body to flow out, liquid level in cylinder is made no longer to increase, all this operation should be carried out respectively to the bitubular, because the deflating valve 43 of each is positioned on same elevation, therefore cylinder is interior after exhaust feed liquor, liquid level can keep same level (with on deflating valve 43 along same level face), now, if when in experimental channel, full-section pipe-flow flow is zero, air pressure in two pressure measurement cylinders is equal, adopt traditional sensor zeroing, compensating circuit initially returns to zero to differential pressure pickup.
2, in real time zeroing electric control valve unit and control circuit thereof (i.e. the control circuit of the high-end electric control valve of pressure reduction 51, pressure reduction low side electric control valve 52 and the control high-end electric control valve 51 of pressure reduction and pressure reduction low side electric control valve 52) are on the pipeline of the gas circuit connecting pipe 49 of differential pressure pickup 46 pressure measurement mouth, be connected to one or more automatically controlled three-way air valve, an automatically controlled three-way air valve can adopt two automatically controlled two breather valves and threeway to combine replacement, and with control circuit, realize the electric control function of differential pressure pickup 46 zeroing in real time.Automatically controlled three-way air valve is all adopted, as shown in Figure 2 and Figure 3 for the high-end electric control valve of pressure reduction 51, pressure reduction low side electric control valve 52.The common port of the high-end electric control valve of pressure reduction 51 (automatically controlled three-way air valve) is connected with the high-pressure side of differential pressure pickup 46, Chang Kaiduan is connected with the valve of pressure reduction high-end liquid cyclostrophic creeling 44; The common port of pressure reduction low side electric control valve 52 (automatically controlled three-way air valve) is connected with the low pressure end of differential pressure pickup 46, Chang Kaiduan is connected with the valve of pressure reduction low side liquid cyclostrophic creeling 48; Fig. 3 is the electric control valve unit electrical control circuit schematic diagram that returns to zero in real time, when by open up pass 53 press time, the high-end electric control valve of pressure reduction 51 (automatically controlled three-way air valve) and pressure reduction low side electric control valve 52 (automatically controlled three-way air valve) are energized, the Chang Kaiduan be connected with the valve of pressure reduction low side liquid cyclostrophic creeling 48 with pressure reduction high-end liquid cyclostrophic creeling 44 is closed, logical atmosphere end is connected with common port, so all logical air in differential pressure pickup 46 two ends, now flow indication value should be zero, if not zero, be then adjustable as zero.This function provides the effect of an in real time zeroing for double-cylinder type high-precision liquid flow instrument, avoid in measurement process traditional instrument when needing to detect zero point and just must can carry out the trouble that verifies by complete shut-down flow valve, this real-time detection function is especially necessary in education experiment.
3, differential pressure pickup 46 is connected to traditional sensor zeroing compensating circuit, can adopt prior art, and realizing differential pressure pickup 46, to input pressure difference signal be zero, and when output voltage is non-vanishing, compensating approach is the function that no-voltage exports.Traditional sensor zeroing compensating circuit cardinal principle is the magnitude of voltage utilizing potentiometer change sensor to export to intelligent digital table, the signal negative terminal voltage that micro computer digital display meter 50 is received can regulate, thus make the displayed value of micro computer digital display meter 50, be adjustable as zero.
4, the digital display voltmeter (i.e. micro computer digital display meter 50) of intelligent (band microcomputer chip), its function had, the signal voltage of input by the method for array matching, makes output become corresponding flow magnitude of physical quantity by energy realization.This micro computer digital display meter 50 is conventional commercial instrument, easily purchases, and can adopt prior art.
Claims (9)
1. possess a self-loopa open channel experimental provision for teaching efficiency flow digital display, it is characterized in that, comprising:
Self-loopa open channel experiment instrument, includes: aqueduct, and one section in described aqueduct is the differential flow signal generator for generation of pressure difference signal;
The pressure reduction high-end liquid cyclostrophic creeling be connected with described differential flow signal generator and the creeling of pressure reduction low side liquid cyclostrophic, the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic are respectively provided with a deflating valve, and these two deflating valves are externally connected with movable sealing plug;
Be tightly connected with the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic, for detecting the differential pressure pickup of the pressure reduction of described pressure reduction high-end liquid cyclostrophic creeling compressed air and pressure reduction low side liquid cyclostrophic creeling compressed air;
Be connected with described differential pressure pickup, the pressure difference signal for being detected by described differential pressure pickup converts the micro computer digital display meter of flow to.
2. the self-loopa open channel experimental provision possessing teaching efficiency flow digital display according to claim 1, is characterized in that, described differential flow signal generator is provided with pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe;
The creeling of described pressure reduction high-end liquid cyclostrophic is provided with the water inlet be communicated with described pressure reduction high side pressure conducting tube;
Described pressure reduction low side liquid cyclostrophic creeling is provided with the water inlet be communicated with described pressure reduction low side pressure transmission pipe.
3. the self-loopa open channel experimental provision possessing teaching efficiency flow digital display according to claim 2, is characterized in that, the water inlet of described pressure reduction high-end liquid cyclostrophic creeling is positioned at the sidewall bottom of described pressure reduction high-end liquid cyclostrophic creeling;
The water inlet of described pressure reduction low side liquid cyclostrophic creeling is positioned at the sidewall bottom of described pressure reduction low side liquid cyclostrophic creeling.
4. the self-loopa open channel experimental provision possessing teaching efficiency flow digital display according to claim 2, it is characterized in that, the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling be arranged on the creeling of described pressure reduction high-end liquid cyclostrophic sidewall and higher than the water inlet of described pressure reduction high-end liquid cyclostrophic creeling;
The deflating valve of described pressure reduction low side liquid cyclostrophic creeling be arranged on the creeling of described pressure reduction low side liquid cyclostrophic sidewall and higher than the water inlet of described pressure reduction low side liquid cyclostrophic creeling.
5. the self-loopa open channel experimental provision possessing teaching efficiency flow digital display according to claim 1, it is characterized in that, the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic are respectively provided with a valve, the valve of described pressure reduction high-end liquid cyclostrophic creeling is described pressure reduction high-end liquid cyclostrophic creeling and the connecting interface of differential pressure pickup, and the valve of described pressure reduction low side liquid cyclostrophic creeling is described pressure reduction low side liquid cyclostrophic creeling and the connecting interface of differential pressure pickup;
The valve of described pressure reduction high-end liquid cyclostrophic creeling is higher than the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling;
The valve of described pressure reduction low side liquid cyclostrophic creeling is higher than the deflating valve of described pressure reduction low side liquid cyclostrophic creeling.
6. the self-loopa open channel experimental provision possessing teaching efficiency flow digital display according to claim 5, is characterized in that, the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling and the deflating valve of described pressure reduction low side liquid cyclostrophic creeling contour.
7. the self-loopa open channel experimental provision possessing teaching efficiency flow digital display according to claim 5, it is characterized in that, also comprise: the high-end electric control valve of pressure reduction, pressure reduction low side electric control valve and control the control circuit of the high-end electric control valve of described pressure reduction and pressure reduction low side electric control valve;
The high-end electric control valve of described pressure reduction be connected on the creeling of described pressure reduction high-end liquid cyclostrophic be connected with differential pressure pickup between in gas circuit; Described pressure reduction low side electric control valve be connected on described pressure reduction low side liquid cyclostrophic creeling be connected with differential pressure pickup between in gas circuit;
The high-end electric control valve of described pressure reduction at least comprises three tunnels, one tunnel of the high-end electric control valve of described pressure reduction is communicated with the valve of described pressure reduction high-end liquid cyclostrophic creeling, another road of the high-end electric control valve of described pressure reduction is measured mouth with described differential pressure pickup first and is connected, and also has a road and air conducting;
Described pressure reduction low side electric control valve at least comprises three tunnels, one tunnel of described pressure reduction low side electric control valve is communicated with the valve of described pressure reduction low side liquid cyclostrophic creeling, another road of described pressure reduction low side electric control valve is measured mouth with described differential pressure pickup second and is connected, and also has a road and air conducting.
8. the self-loopa open channel experimental provision possessing teaching efficiency flow digital display according to claim 1, is characterized in that, described self-loopa open channel experiment instrument also includes:
Self-loopa supply tank;
By the water tank of voltage regulation that described aqueduct is communicated with described self-loopa supply tank;
To be arranged in described self-loopa supply tank and electric control pump for supplying water to described water tank of voltage regulation;
Experimental trough, the head side of described experimental trough is communicated with described water tank of voltage regulation, the porous tail-gate that turning axle is rotatably connected with described experimental trough is provided with in the afterbody of described experimental trough, described turning axle is erected in described experimental trough along the Width of described experimental trough, and the afterbody bottom surface of described experimental trough is provided with the lower mouth of a river;
For accepting the triangular-notch weir flume of the lower mouth of a river water outlet of described experimental trough, be provided with water-stabilizing board, triangular-notch weir and water return outlet from the side, the lower mouth of a river near described experimental trough successively to opposite side in described triangular-notch weir flume, described water return outlet is communicated with described self-loopa supply tank.
9. the self-loopa open channel experimental provision possessing teaching efficiency flow digital display according to claim 2, it is characterized in that, be provided with orifice plate in the pipeline section of the aqueduct at described differential flow signal generator place, described pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe are positioned on the aqueduct of described orifice plate both sides.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949718A (en) * | 2015-06-12 | 2015-09-30 | 浙江大学 | Self-circulation open channel experimental device with teaching effect flow digital display function |
| CN106813758A (en) * | 2017-02-22 | 2017-06-09 | 苏州市计量测试研究所 | A kind of flow measurement device for borne bacteria sampler |
-
2015
- 2015-06-12 CN CN201520407771.2U patent/CN204788517U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949718A (en) * | 2015-06-12 | 2015-09-30 | 浙江大学 | Self-circulation open channel experimental device with teaching effect flow digital display function |
| CN106813758A (en) * | 2017-02-22 | 2017-06-09 | 苏州市计量测试研究所 | A kind of flow measurement device for borne bacteria sampler |
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